This commit adds a check for the 'error' key in the json object and
skips the file if so.  It also checks for a couple of keys that may or
may not be present depending on the configuration.

Document the evaluation order of the Telegraf token

Check for existance of keys in dict

Prior to this commit, the error checking was too aggressive and resulted
in emitting no metrics from PDB json files.  This is because the 'error'
object is always in the result and we need to check the length of its
values.

Fix handling of 'error' entry in dict

Prior to this commit, using the grafana_datasource resource with "secure
json" parameters was not idempotent.  This is because the api obfuscates
these values, so we can't check the state of the datasource using this
resource.

This commit uses the "provisioning" directory to set the datasource at
service startup.  It uses a template to create the file so the token can
be a Sensitive type and be redacted from logs and reports.

It also adds an exec to make sure Grafana is ready to accept
connections.

Prior to this commit, we did not create a postgres role for telegraf or
grant it any permissions.  This add two pe_postgresql_psql resources to
accomplish this.

This is required due to this from the posgres docs:

To connect to a particular database, a user must not only pass the
pg_hba.conf checks, but must have the CONNECT privilege for the database

(SUP-3201) Make Grafana datasource idempotent

Prior to this commit, $token was declared as a Sensitive[String], but we
may recieve an Undef value if the token was created in the current
catalog application.  This commit accepts any Sensitive value to account
for this.

(SUP-3201) Accept any Sensitive value in template

(SUP-3209) Grant pg_monitor role to telegraf

Prior to this commit, the acceptance test setup was failing to apply the
influxdb::profile::toml class as it requires the pe-puppetserver
service. It also needed the toml-rb to be installed in the puppet gem
space. This commit adds the pe-puppetserver service resource to the
puppet apply and includes the toml-rb gem for puppet_gem.

Prior to this commit, the puppet apply statements in the acceptance
tests expected a failure. This commit changes it to allow for changes or
no changes on the applies.

Enable Acceptance Testing

Prior to this commit, we used an exec resource to check if the grafana
service were ready to receive connections.  However, this didn't account
for initial provisioning, and it's a bit of a hack.  This commit uses an
ExecStartPost directive instead, which is better because it allows us to
use metaparameters like 'require' directly on the service.

(SUP-3201) Check port availability with systemd

(SUP-3228) Fix Ubuntu compatibility issue

make resource ordering specific to install class

(SUP-3061) Install class for ent infrastructure agents

Prior to this commit, Ubuntu provisioning would fail if the latest
telegraf package were newer than the $version parameter.  This looks to
be because only the latest package is available in the Ubuntu repo.
This commit changes the ensure property to be 'latest' on Ubuntu, and
changes the archive url to use the $version parameter.

Also, re-add the no-lookup_in_parameter check to disabled lint checks.

Update example to read token from disk

(SUP-3235) Use latest telegraf package on Ubuntu

This commit adds an additional query to the postgres plugin to select
index statistics for tables in the pe-puppetdb database.

It also adds the datname of the current database, which fixes a bug
where we were emitting metrics with a tag of 'postgres', because that is
the default database.

This commit uses an example query from the postgres docs to get sizes
for all relation types in one query.  It also updates the dashboard to
  display this data.

(SUP-3243) Add index stats for pe-puppetdb tables

This commit also fixes an issue with the queue_depth metrics, which
comes from the /v1/status endpoint.

Add panels for PDB read and write pools

This commit changes these two panels to group by the name of the
function and http-client metric, thereby displaying all of them.  The
function counts now also use non_negative_difference over the time
interval, since this is a cumulative total.

Display all http client and function metrics

(SUP-3241) Add in Dashboard documentation

Bump influxdb dependency to 1.0

Release prep v1.0.0